/**
 * Copyright (c) 2008, Mu Dynamics.
 *  All rights reserved.
 *  
 *   Redistribution and use in source and binary forms, with or without modification, 
 *   are permitted provided that the following conditions are met:
 *   
 *  - Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice, 
 *     this list of conditions and the following disclaimer in the documentation and/or 
 *     other materials provided with the distribution.
 *  - Neither the name of the "Mu Dynamics" nor the names of its contributors may be used 
 *     to endorse  or promote products derived from this software without specific prior 
 *     written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.mu.jacob.core.renderer;

import java.io.File;
import java.util.Map.Entry;

import org.antlr.stringtemplate.StringTemplate;
import org.antlr.stringtemplate.StringTemplateGroup;

/**
 * Stringtemplates renderer
 * 
 * @author Adam Smyczek
 *
 */
public class StringTemplateRenderer extends AbstractRenderer {
    
	/* Template group */
	private StringTemplateGroup templateGroup;
	
	/* Global template group */
	private File globalTemplateGroup;
	
	public void setGlobalTemplateGroup(final File globalTemplateGroup) {
		if ((globalTemplateGroup != null) && globalTemplateGroup.exists()) {
				this.globalTemplateGroup = globalTemplateGroup;
		}
	}
	
	/**
	 * @see com.mu.jacob.core.renderer.IRenderer#render(java.io.File)
	 */
	public String render(File templateFile) throws Exception {
		initEngine();
	    StringTemplate template = getTemplateGroup().getInstanceOf(templateFile.getAbsolutePath());
	    template.setPassThroughAttributes(true);
		for (Entry<String, Object> e : getContextMap().entrySet()) {
			template.setAttribute(e.getKey(), e.getValue());
		}
	    String result = template.toString();
	    return result;
	}
	
	/**
	 * Initialize template groups
	 */
	@Override
	protected void initEngine() {
		templateGroup = new StringTemplateGroup("templates", getTemplateRoot().getAbsolutePath());
		// disable caching
		getTemplateGroup().setRefreshInterval(0);

		// set group for global templates
		if (globalTemplateGroup != null) {
			getTemplateGroup().setSuperGroup(new StringTemplateGroup("global", globalTemplateGroup.getAbsolutePath()));
		}
	}
	
	/**
	 * @return template group
	 */
	protected StringTemplateGroup getTemplateGroup() {
		return templateGroup;
	}

	/**
	 * @return global template group
	 */
	protected File getGlobalTemplateGroup() {
		return globalTemplateGroup;
	}
	
}
